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CHAPTER 4 ∣ MAGNETISM (4.1 Magnetic field A region around a magnet where…
CHAPTER 4 ∣ MAGNETISM
4.5 Forces between two parallel current-carrying
conductors
Force per unit length
4.6 Torque on a coil
4.1 Magnetic field
A region around a magnet where a magnetic force can be experienced.
What is magnetic field lines?
Line to present Magnetic Field
Sources of magnetic field
Magnet
Magnetic field of the earth
Current carrying conductor
Magnetic field lines pattern
Magnetic flux density, B
magnetic induction (magnetic field intensity OR strength)
𝞥 = magnetic flux
A ⫠ = area at right angles to magnetic field
unit is Tesla (T) OR weber per metre squared (Wb m -2).
4.3 Force on a moving charged particle in a uniform
magnetic field
direction of the magnetic force
4.4 Force on a current-carrying conductor in a uniform
magnetic field
The direction of the magnetic force can be determined by using the Fleming’s left hand rule
4.2 Magnetic field produced by current-carrying
conductor
Magnetic field of a circular coil
μ0 :permeability of free space
R :radius of the circular coil
N :number of coils (loops)
I :current
Magnetic field of a long straight conductor (wire) carrying current
μ0 :permeability of free space
= 4pi x 10−7 A m T −1
r :distance of a point from a straight conductor(wire)
Magnetic field of a solenoid
n :number of turns per unit length
4.7 Motion of charged particle in magnetic field and
electric field
NOORAIN SALWANI BINTI FAUZI
T18
KNFT19099
